Abstract Twenty-six collaborators participated in the study of a specific method using oxygen flask combustion followed by mercurimetric titration of the ionic halide. With the exception of 3 collaborators, all obtained good results for bromine, although a fourth collaborator obtained borderline results. Including data from all collaborators gave: mean, 36.90%; mean–theory, -0.43%; standard deviation, 0.31; and standard deviation of the means, 1.59. Omitting results of 3 collaborators, the figures become: 37.36%, +0.03%, 0.20, and 0.20, respectively. Omitting results of 4 collaborators, the values become: 37.33%, 0.00%, 0.18, and 0.15, respectively. Similar results were obtained for chlorine. The results from all collaborators gave: mean, 20.76%; mean – theory, -0.14%; standard deviation, 0.18; and standard deviation of the means, 0.48. Omitting results of 3 collaborators (the same as those for bromine), the values are : 20.89%, -0.01%, 0.14, and 0.12, respectively. Omitting the results of a fourth collaborator was not considered necessary, because the results for chlorine were borderline, and including them still gave a good overall picture. The method was adopted as official first action as an alternative to the Carius method for the determination of bromine and chlorine in organic compounds.